Factors affecting transformer oil flow electrification in electric power apparatus

Radwan, R.M.; El-Dewieny, Reda M.K.; Aish, T.D.; Metwally, I.A.

doi:10.1109/ceidp.1990.201410

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…Many papers on flow electrification in transformers have been published to identify the various factors that influence this phenomenon. The most important ones are temperature, moisture, the oil flow rate, aging of oil, oil electrical charging tendency, and surface condition [10,[15][16][17][18]. Some experimental measurements have reported that the overall flow electrification increases with temperature to a certain limit situated between 40 • C and 60 • C before decreasing [19].…”

Section: Static Electrification and Flow Electrificationmentioning

confidence: 99%

Electrical-Based Diagnostic Techniques for Assessing Insulation Condition in Aged Transformers

Fofana

Hadjadj

2016

Energies

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Abstract:The condition of the internal cellulosic paper and oil insulation are of concern for the performance of power transformers. Over the years, a number of methods have been developed to diagnose and monitor the degradation/aging of the transformer internal insulation system. Some of this degradation/aging can be assessed from electrical responses. Currently there are a variety of electrical-based diagnostic techniques available for insulation condition monitoring of power transformers. In most cases, the electrical signals being monitored are due to mechanical or electric changes caused by physical changes in resistivity, inductance or capacitance, moisture, contamination or aging by-products in the insulation. This paper presents a description of commonly used and modern electrical-based diagnostic techniques along with their interpretation schemes.

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Section: Static Electrification and Flow Electrificationmentioning

confidence: 99%

Electrical-Based Diagnostic Techniques for Assessing Insulation Condition in Aged Transformers

Fofana

Hadjadj

2016

Energies

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“…N o maximum was found in transformer oils, at any flow rate, either during the ministatic charger experiments [33,39,43] or in model duct and pipe installations [53,109] and rotating models [121] including spinning discs [123]. However, a maximum was found for a transformer oil when the ministatic tester had a glass filter [127]. Also, liquids other than transformer oil (perchloroethylene) had distinct maxima of ECT [53].…”

Section: Effect Of Temperaturementioning

confidence: 98%

“…Other tests carried out with a spinning disc system were reported by Radwan et al [127,128]. In a system with a vessel of 160 m m diameter and a disc of 80 mm diameter, the rotational speed was varied to a maximum of 1100 rpm and the temperature was changing from 20 to 80°C.…”

Section: Spinning Disc Systemsmentioning

confidence: 99%